Passiflora 'Snow Queen' has large, strongly fragrant, pure white flowers with long corona filaments.

Passiflora 'Star of Surbiton' has pure white petals that form the backdrop for bright purple-blue filaments.

Pelargonium crispum 'Lemona' is a tender, lemon-scented geranium with pink and magenta flowers that are both ornamental and edible.

Pelargonium 'Captain Starlight' is a delightful geranium with magenta, pink and white flowers.

Pelargonium 'Orange Fizz' is a tender,citrus-scented geranium with single flowers that are pink and purple and scented with evergreen foliage.

Pelargonium 'Sweet Mimosa' is a tender, spicy-scented geranium with single flowers that are pink and red with scented evergreen foliage.

Perovskia atriplicifolia 'Blue Steel' has some of the darkest blue flowers of the Russian sages.

Perovskia 'Denim 'n' Lace' is a dwarf cultivar of Russian sage with silvery foliage and purple-blue flowers.

Perovskia 'Lacey Blue' is a dwarf cultivar of Russian sage with the classic silver-green foliage and purple-blue flowers.

Perovskia 'Silvery Blue' is a dwarf cultivar of Russian sage with extra silver foliage and purple-blue flowers.

This evergreen orchid sports 12" spikes of waxy, fragrant yellow flowers with red markings on the lip in early summer.

Philadelphus 'Snowbelle' is a hardy shrub with deliciously fragrant, double white flowers.

Phlox 'Minnie Pearl' has sweetly fragrant, pure white flowers on stems 1-2 feet tall with shiny, mildew-free leaves.

Phlox divaricata 'Blue Moon' is an eastern North American native ground cover with fragrant, pale blue flowers.

Phlox divaricata 'Blue Ribbons' is a woodland ground cover with fragrant lavender-blue flowers and variegated foliage.

Phlox divaricata 'Chattahoochee' is an eastern NA native ground cover with pale lavender flowers with magenta eyes.

Phlox divaricata 'May Breeze' is an eastern NA native ground cover with white flowers sometimes with palest lavender.

Carpets of fragrant violet blue flowers in spring.

Phlox paniculata 'Aureole' has charming, bright fuchsia blooms edged in contrasting chartreuse on short stems with a gentle, old-fashioned fragrance.